At some point in the future when an asteroid hits Earth

Do you wish? There will be an end of the world.

Hello dear. The asteroid will not hit the Earth in 2023. According to the current observations and **, there is no possibility that an asteroid will hit the Earth in 2023.

The International Astronomical Union (IAU) and NASA have been keeping an eye on asteroids that could threaten the Earth and will release relevant information in a timely manner. If a new risk of impact arises, the public will be alerted and dealt with in a timely manner. Therefore, at present, we can rest assured that we do not need to worry too much about the problem of the virtual wheel heart.

Generally speaking, after an asteroid hits the Earth, a large crater is formed at the site of impact, and some of the ground material is shattered into dust and thrown high into the air, potentially ending up scattered around the globe. For a long time, this dust prevents sunlight from reaching the ground, which in turn affects climate change, geological structure change, and the growth and extinction of organisms. The asteroid itself will also partially dissolve and vaporize during the impact process, and some of its special elements and isotopic components are mixed with the earth's material, causing abnormalities in the composition of some elements and isotopes in the rocks formed by the earth during this period.

In 1979, scientists discovered a 1 2 cm thick layer of reddish-brown clay in a stratum in central Italy, which was deposited in a very short period of time about 65 million years ago, and the iridium content in it was significantly anomalous. The earth's soil and rocks contain very little iridium, but the iridium content in this layer of clay is 20,200 times higher than the normal level of iridium on the earth. Later, scientists found abnormal levels of iridium in strata deposited during this period in many parts of the world.

Scientists know that the celestial bodies and dust in the universe contain a large amount of iridium, so it is speculated that 65 million years ago, there was an asteroid with a diameter of about 10 kilometers that hit the earth and caused a large **, ** heat wave will impact a large amount of cosmic material and the mixture of earth material into the atmosphere, and disperse the world, after a period of time, the earth's surface cools, dust falls to the surface, thus forming a thin layer with particularly high iridium content.

Again, there is a problem: how does the impact of an asteroid or comet on the Earth be random, it has a certain probability, and there is no periodicity, so how can this explain the cycle of about 100 million years of mass extinction? The emergence of periodic mass extinctions is likely still related to the movement of the sun in the Milky Way.

When the Sun passes through certain special locations in the Milky Way, such as landmarks, the likelihood of the Earth being hit by comets or asteroids is greatly increased due to the intensification of cosmic rays in these areas, or the density of galaxies. On a large-scale scale of billions of years, the evolution of living things shows a certain periodicity.

***。Dec. 25 -- NASA.

Scientists said on Thursday that a recently discovered asteroid had a 1,300 chance of crashing into Earth in 2029, but stressed that the danger of an asteroid about 1,300 feet long crashing into Earth would probably disappear once astronomers learn more details about its orbit.

According to Hong Kong's Wen Wei Po comprehensive foreign news and NASA** news, the "Near-Earth Stars Project" manager of the Jet Propulsion Laboratory of the US Space Administration said that the asteroid 2004 Mn4

There are a limited number of sightings, in Tori, who is divided into 10 levels.

It has a preliminary rating of 2 on the No. 2 impact crisis scale, which astronomers use to identify asteroids or comets.

Chance of impact, with a level of 2 indicating that "the discovery of a star passing by the Earth in close proximity but not in a highly unusual manner, but as the actual impact is unlikely, there is no reason for public concern or concern, and the new astronomical observations are likely to result in a re-rating of 0 (i.e., no dangerous collision)".Previously observed asteroids have never been rated higher than 1

"On Friday, April 13, 2029, we do not rule out the possibility that this asteroid will hit Earth," Yeoman said. If this unlikely thing happens, the situation will be serious.

If it crashes into the ocean, there will be a tsunami, otherwise it will cause severe ground damage. He added: "No one should be worried, but every time we publish this news, some people go crazy."

The asteroid, which was discovered on June 19 and was observed again this month, is estimated to be about 1,600 megatons of energy at a length of about 1,320 feet.

The asteroid 2004 Mn4 takes less than a year (323 days) to orbit the Sun, passing through Earth orbit twice for each orbit.

The asteroid will be visible in the coming months, and the Near-Earth Star Project has notified stargazers to look for 2004 mn4The asteroid has been observed about 40 times so far, for the first time at an observatory near Arizona in the United States, and this month in Australia and New Zealand.

It seems a bit unfounded!!

Even if you're 10 years old! I was 91 years old at that time!!

Most people don't live to that day!!

Is it an official message or a legend? Small lines related to the earth have been numbered and tracked internationally.

If there is an asteroid, it may approach the Earth.

The international community will certainly act.

So the subject is overwhelmed.

It may be possible, but human technology has developed and it should be possible to stop it from happening.

Because an asteroid hit the earth, it caused the dinosaurs to go extinct.

In 1980, Nobel laureate in physics Louis Alvarez, his sons Walter Alvarets, Frank Asaro, Helen Michel and others found that the global Cretaceous and Paleogene strata had higher levels of iridium than normal.

For example, the iridium content of the two formations in the original study was 30 times and 130 times the normal standard, respectively. Iridium is a very rare metal in the earth's crust and is an ironphilic element.

Most of the ferrophilic elements settle into the Earth's core, such as iron, during the planetary differentiation. Since iridium is often found in most asteroids and comets, Alvarez et al. believe that an asteroid hit the Earth's surface at the beginning of the Cretaceous and Paleogene periods.

Dinosaur development history:

Dinosaurs flourished in the Mesozoic Era, dominating for a while, and the earth became a world of "dragons". For example, the winged dragon flying in the air, the forelimbs become flying organs, the ichthyosaur that lives in the water, the Lufeng dragon that lives on land or in the swamp, and the Hechuan Mamenxi dragon are all typical representatives. Non-avian dinosaurs lived on Earth for hundreds of millions of years, and a branch of theropod dinosaurs branched off into birds, but at the end of the Cretaceous period, they suddenly disappeared from all parts of the world.

This is due to the strong orogeny, changes in topography, climate and food shortages, etc., the ancient reptiles, dinosaurs, which dominated the earth for more than 100 million years, were completely extinct at the end of the Mesozoic Era.